<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./math.js"></script>
    <link rel="stylesheet" href="./main.css">
</head>
<body>
    <div>123122311</div>
    <img src="./1.png" alt="">
    <ul>
        <li>1</li>
        <li>2</li>
        <li>3</li>
    </ul>
    <script>
        console.dir(document.querySelector('div'))
    </script>
</body>
</html>